Automatic draft regulator



July 31, 1923. 1,463,671

V. B.- CARR ET AL AUTOMATIC DRAFT REGULATOR Filed Dec. 8, 1921 ATTORNEYSPatented duly 31, 1923.

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VERNON Bnaoronn cane AND seiviUE finesse: naosnna, or LnBAnor 'innreiva.

AUTOMATIC liners REGULATOR.

Application filed December 8, 1921. Serial No. 520,977.

T all whom it may concern: 1

Be it known that we, VE non B. Cimnand SAMUEL H. BnosHAR, both citizensof the United States, and residents of Lebanon, in the county of Booneand State of Indy ana, have inventeda new and useful improvement inAutomatic Draft Regulators,

of which the following is a full, clear, and

exact description. Our invention relates to improvements in automaticdraft regulators for furnaces or the like, and it consists in thecombinations, constructions and arrangements herein described andclaimed. 7 1 An object of our invention is to provide an automatic draftregulator for a furnace which is actuated-by the steam pressure in theboiler. i

A further object of our invention to provide a device of the characterdescribed which has adjustable means for automatically keeping'the'pressure ofQs't'eam in the boiler a predetermined point.

A further object of our invention is to provide a device of the typedescribed, which automatically regulates the opening and closing of thedraft door and also the opening and closing of the check draft.

A. further object of our invention is to provide a device of the typedescribed, which is relatively simple in construction and which is notlikely to easily get out of order.

Other objects and advantages will appear:

in the following specification, and thenovel pointed out in the appendedclaim. I Our invention is illustrated in the accompanying drawings,forming part of this application, in which Figure 1 is a front elevationof the de vice as shown applied to a furnace, parts of the device beingshown in section, and

2 is a sectional view of the device.

In carrying outour invention, we make use of a furnace 1, of ordinaryconstruction, which has a pipe 2 integral with the top thereof. We thenprovide a casing 3 which has a boss 4 at the lower end thereof andthrough which the pipe 5 is disposed; The pipe 5 is adapted to extend ashort distance into the pipe 2 and thus securely holds the casing 3 tothe furnace 1. The casing 3 is divided into two compartments 6 and 7 bymeans of a centrally disposed partition 8. The partition 8 extendswithin a spaced distance from the bottom 9 of the casing 3, thusfeatures of the invention will be particularly providing an openinglObetween the compartment 6 and the compartment T. Slidablv disposed inthe compartment? is float 11, the float being provided with to a.vertical bifurcated rod 1.2 which is adapted; to extend through anopening 13 in the top 14E of they casing 3. The casing 3 is furtherprovidedwith an inlet 15 through which water is; adapted to be pouredfor a purpose which will he hereinafter dee -ribed. It will be apparentthat variation'in the level of the water in thecham'ber 7 will raise orlower the float x .1

The furnacel isprovided with the usual draft regulator 16 and a checkdraft 1?. The draft 16 and check draft 1? are connected to each other bymeans of'a cable 18 which is disposed over two pul eys 19 the latterbeing secured to a transverse beam 20. bar or lever 21 is pivotallymounted on a support 22 and has, one of its ends connected to the cable18. -The casing 3 carries two guide members 23 in which the bar 21 isslidably disposed. The bar 21 is also disposed in the slot of the rod 12and is secured thereto by means of a pin 24. It will now be obvious thatany movement of the float 11 will actuate the doors 16 and 17.Counterbalanc'e weights 2-5 are slidably disposed on the lever 21. Thechamber 7 is further provided with a graduated water tube 26 and is alsoprovided with an air valve 27. v 7

From the foregoing description of the, various parts of the' device, theoperation thereof may be readily understood. It will be obvious that anyvariation of the length of the pipe 5 which extends into the chamber 6will also vary the level of the water in the chamber. The pipe 5 is indirect communication with the steam boiler 27 of the furnace 1. Assumenow that the steam is being generated in theboiler 27'. The steam willrise in the pipe 5 and will pass into the 7 upper portion of the chamber6 and will force the level of the water in the chamber fidownwardly. Thewater from the chainher6 will pass through the opening 10 and into thechamber 7, thus raising the float 11, which in turn will swing the lever21 so as to closethe'door 16 and to open the door 17. It will beobserved therefore that a less quantity of air will be admitted intothem) furnace 1 and that a greater quantity of air will. be admittedinto the smoke. pipe 28,

This will cause the fire in the furnace to die down. The steam pressurein the boiler 27 and the chamber 6 will therefore be low ered and thelevels of the water in the charm bers 6 and 7 will resume their normalpositions, thus lowering the float 11. The lever 21 will then be swungback to normal position and will open the door 16 and close the door 17.

It will be apparent that this device is automatic in operation and willeffectually keep the steam pressure in the boiler 2'? at a predeterminedpoint. It will further be observed that the raising or lowering of thepipe 5 with respect to the chamber 6 will vary the length 01? the strokeof the float ill in the chamber '7, In some types of furn ce's, thedoors 16 and 17 have to be swung through a greater are than the doors ofother types of furnaces. By merely changing the position of the pipe 5in the chamber 6, we can readily determine the length of the movement ofthe float 11, which in turn, regulates the movement of the doors 16 and17. Therod 12 is provided with a plurality of openings 29 therein,through which the pin can be disposed. This construction provides'a fineadjustment between, the float 11 and the cable 18. The graduated watertube 26 shows at any time what steam pressure there is in the boiler 27,since the variation of the steam pressure in the boiler 27 will raise orlower the level of the water in the tube 26. In the present instance wehave graduated the pipe to show a variation of steam pressure in ounces.

, ment, and means operatively connecting said draft and check doors tosaid float, said means comprising a bifurcated rod supported on saidfloat, said rod having a plurality of spaced apart. holes extendingtransversely therethrough, a lever pivotally mounted intermediate itslength on said casing and having an opening therethrough, a pin arrangedto be received in the opening of said lever and in one of the openingsin said rod, and cables connected at one end with said lever and withsaid check and draft doors respectively.

VERNON BEAUFORD CARR. V SAMUEL HERBERT BROSHAR'.

